/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.polarrose.spring.bayeux.examples.chat;

import com.polarrose.spring.bayeux.BayeuxClient;
import com.polarrose.spring.bayeux.BayeuxFilter;
import com.polarrose.spring.bayeux.BayeuxServer;
import org.springframework.beans.factory.annotation.Required;

import java.util.HashSet;
import java.util.Set;
import java.util.StringTokenizer;

/**
 *
 */

public class ChatFilter implements BayeuxFilter<ChatMessage>
{
    private Set<String> words = new HashSet<String>();

    @Required
    public void setWords(Set<String> words) {
        this.words = words;
    }

    public ChatMessage filter(BayeuxServer bayeux, BayeuxClient from, ChatMessage o) {
        StringBuilder sb = new StringBuilder(o.getText().length());

        StringTokenizer st = new StringTokenizer(o.getText());
        while (st.hasMoreTokens()) {
            String token = st.nextToken();
            if (words.contains(token)) {
                token = token.replaceAll("[euioa]", "*");
            }
            if (sb.length() != 0) {
                sb.append(" ");
            }
            sb.append(token);
        }

        o.setText(sb.toString());

        return o;
    }
}
